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37141ff7
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2019-10-21T18:56:59
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patch_parse: detect overflow when calculating old/new line position
When the patch contains lines close to INT_MAX, then it may happen that
we end up with an integer overflow when calculating the line of the
current diff hunk. Reject such patches as unreasonable to avoid the
integer overflow.
As the calculation is performed on integers, we introduce two new
helpers `git__add_int_overflow` and `git__sub_int_overflow` that perform
the integer overflow check in a generic way.
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468e3ddc
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2019-10-19T16:48:11
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patch_parse: fix out-of-bounds read with No-NL lines
We've got two locations where we copy lines into the patch. The first
one is when copying normal " ", "-" or "+" lines, while the second
location gets executed when we copy "\ No newline at end of file" lines.
While the first one correctly uses `git__strndup` to copy only until the
newline, the other one doesn't. Thus, if the line occurs at the end of
the patch and if there is no terminating NUL character, then it may
result in an out-of-bounds read.
Fix the issue by using `git__strndup`, as was already done in the other
location. Furthermore, add allocation checks to both locations to detect
out-of-memory situations.
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6c6c15e9
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2019-10-19T15:52:35
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patch_parse: reject empty path names
When parsing patch headers, we currently accept empty path names just
fine, e.g. a line "--- \n" would be parsed as the empty filename. This
is not a valid patch format and may cause `NULL` pointer accesses at a
later place as `git_buf_detach` will return `NULL` in that case.
Reject such patches as malformed with a nice error message.
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223e7e43
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2019-10-19T15:42:54
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patch_parse: reject patches with multiple old/new paths
It's currently possible to have patches with multiple old path name
headers. As we didn't check for this case, this resulted in a memory
leak when overwriting the old old path with the new old path because we
simply discarded the old pointer.
Instead of fixing this by free'ing the old pointer, we should reject
such patches altogether. It doesn't make any sense for the "---" or
"+++" markers to occur multiple times within a patch n the first place.
This also implicitly fixes the memory leak.
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11de594f
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2019-10-16T22:11:33
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patch_parse: handle patches without extended headers
Extended header lines (especially the "index <hash>..<hash> <mode>") are
not required by "git apply" so it import patches. So we allow the
from-file/to-file lines (--- a/file\n+++ b/file) to directly follow the
git diff header.
This fixes #5267.
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585fbd74
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2019-08-28T23:18:31
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apply: Test for EOFNL mishandling when several hunks are processed
Introduce an unit test to validate that git_apply__patch() properly
handles EOFNL changes in case of patches with several hunks.
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fd7a384b
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2019-07-20T11:24:37
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Merge pull request #5159 from pks-t/pks/patch-parse-old-missing-nl
patch_parse: handle missing newline indicator in old file
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b0893282
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2019-07-11T12:12:04
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patch_parse: ensure valid patch output with EOFNL
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3f855fe8
|
2019-07-05T11:06:33
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patch_parse: handle missing newline indicator in old file
When either the old or new file contents have no newline at the end of
the file, then git-diff(1) will print out a "\ No newline at end of
file" indicator. While we do correctly handle this in the case where the
new file has this indcator, we fail to parse patches where the old file
is missing a newline at EOF.
Fix this bug by handling and missing newline indicators in the old file.
Add tests to verify that we can parse such files.
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dedf70ad
|
2019-07-05T09:35:43
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patch_parse: do not depend on parsed buffer's lifetime
When parsing a patch from a buffer, we let the patch lines point into
the original buffer. While this is efficient use of resources, this also
ties the lifetime of the parsed patch to the parsed buffer. As this
behaviour is not documented anywhere in our API it is very surprising to
its users.
Untie the lifetime by duplicating the lines into the parsed patch. Add a
test that verifies that lifetimes are indeed independent of each other.
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30c06b60
|
2019-03-22T23:56:10
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patch_parse.c: Handle CRLF in parse_header_start
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9d65360b
|
2019-03-29T12:30:37
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tests: diff: test parsing diffs with a new file with spaces in its path
Add a test that verifies that we are able to parse patches which add a
new file that has spaces in its path.
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72630572
|
2017-03-30T22:40:47
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patch: add support for partial patch application
Add hunk callback parameter to git_apply__patch to allow hunks to be skipped.
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ecf4f33a
|
2018-02-08T11:14:48
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Convert usage of `git_buf_free` to new `git_buf_dispose`
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80226b5f
|
2017-09-22T13:39:05
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patch_parse: allow parsing ambiguous patch headers
The git patch format allows for having unquoted paths with whitespaces
inside. This format becomes ambiguous to parse, e.g. in the following
example:
diff --git a/file b/with spaces.txt b/file b/with spaces.txt
While we cannot parse this in a correct way, we can instead use the
"---" and "+++" lines to retrieve the file names, as the path is not
followed by anything here but spans the complete remaining line. Because
of this, we can simply bail outwhen parsing the "diff --git" header here
without an actual error and then proceed to just take the paths from the
other headers.
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89a34828
|
2017-06-16T13:34:43
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diff: implement function to calculate patch ID
The upstream git project provides the ability to calculate a so-called
patch ID. Quoting from git-patch-id(1):
A "patch ID" is nothing but a sum of SHA-1 of the file diffs
associated with a patch, with whitespace and line numbers ignored."
Patch IDs can be used to identify two patches which are probably the
same thing, e.g. when a patch has been cherry-picked to another branch.
This commit implements a new function `git_diff_patchid`, which gets a
patch and derives an OID from the diff. Note the different terminology
here: a patch in libgit2 are the differences in a single file and a diff
can contain multiple patches for different files. The implementation
matches the upstream implementation and should derive the same OID for
the same diff. In fact, some code has been directly derived from the
upstream implementation.
The upstream implementation has two different modes to calculate patch
IDs, which is the stable and unstable mode. The old way of calculating
the patch IDs was unstable in a sense that a different ordering the
diffs was leading to different results. This oversight was fixed in git
1.9, but as git tries hard to never break existing workflows, the old
and unstable way is still default. The newer and stable way does not
care for ordering of the diff hunks, and in fact it is the mode that
should probably be used today. So right now, we only implement the
stable way of generating the patch ID.
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adedac5a
|
2016-09-02T02:03:45
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diff: treat binary patches with no data special
When creating and printing diffs, deal with binary deltas that have
binary data specially, versus diffs that have a binary file but lack the
actual binary data.
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94e488a0
|
2016-04-24T16:14:25
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patch: differentiate not found and invalid patches
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17572f67
|
2016-04-21T00:04:14
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git_patch_parse_ctx: refcount the context
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440e3bae
|
2015-11-21T12:27:03
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|
patch: `git_patch_from_patchfile` -> `git_patch_from_buffer`
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0ff723cc
|
2015-09-25T12:09:50
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apply: test postimages that grow/shrink original
Test with some postimages that actually grow/shrink from the
original, adding new lines or removing them. (Also do so without
context to ensure that we can add/remove from a non-zero part of
the line vector.)
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82175084
|
2015-09-23T13:40:12
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Introduce git_patch_options, handle prefixes
Handle prefixes (in terms of number of path components) for patch
parsing.
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2f3b922f
|
2015-09-22T18:54:10
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patch_parse: test roundtrip patch parsing -> print
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42b34428
|
2015-09-22T18:54:10
|
|
patch_parse: ensure we can parse a patch
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8bca8b9e
|
2015-09-16T14:40:44
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apply: move patch data to patch_common.h
|