commit | 7f53f78b04b49c2060c23df6566aceb3ba394aea | [log] [tgz] |
---|---|---|
author | Jeff King <peff@peff.net> | Thu Jun 10 08:58:43 2021 -0400 |
committer | Junio C Hamano <gitster@pobox.com> | Fri Jun 11 12:37:07 2021 +0900 |
tree | 038023d16299addc171f72fbe0e28f8987382c39 | |
parent | 7d879ad7e02f1f4d7f504862b280e503db403a36 [diff] |
ll_union_merge(): pass name labels to ll_xdl_merge() Since cd1d61c44f (make union merge an xdl merge favor, 2010-03-01), we pass NULL to ll_xdl_merge() for the "name" labels of the ancestor, ours and theirs buffers. We usually use these for annotating conflict markers left in a file. For a union merge, these shouldn't matter; the point of it is that we'd never leave conflict markers in the first place. But there is one code path where we may dereference them: if the file contents appear to be binary, ll_binary_merge() will give up and pass them to warning() to generate a message for the user (that was true even when cd1d61c44f was written, though the warning was in ll_xdl_merge() back then). That can result in a segfault, though on many systems (including glibc), the printf routines will helpfully just say "(null)" instead. We can extend our binary-union test in t6406 to check stderr, which catches the problem on all systems. This also fixes a warning from "gcc -O3". Unlike lower optimization levels, it inlines enough to see that the NULL can make it to warning() and complains: In function ‘ll_binary_merge’, inlined from ‘ll_xdl_merge’ at ll-merge.c:115:10, inlined from ‘ll_union_merge’ at ll-merge.c:151:9: ll-merge.c:74:4: warning: ‘%s’ directive argument is null [-Wformat-overflow=] 74 | warning("Cannot merge binary files: %s (%s vs. %s)", | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 75 | path, name1, name2); | ~~~~~~~~~~~~~~~~~~~ Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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