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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2023-12-21 16:53:57 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-01-20 11:51:46 +0100 |
| commit | ffcaafdb8be64555e9928d943a3655c755dba92b (patch) | |
| tree | c3319b1850767d660b4573210b956e24c8f00e10 /lib/idr.c | |
| parent | 766c6c1dd1403a5212888c74647532800169345c (diff) | |
| download | linux-ffcaafdb8be64555e9928d943a3655c755dba92b.tar.gz linux-ffcaafdb8be64555e9928d943a3655c755dba92b.tar.bz2 linux-ffcaafdb8be64555e9928d943a3655c755dba92b.zip | |
ida: Fix crash in ida_free when the bitmap is empty
[ Upstream commit af73483f4e8b6f5c68c9aa63257bdd929a9c194a ]
The IDA usually detects double-frees, but that detection failed to
consider the case when there are no nearby IDs allocated and so we have a
NULL bitmap rather than simply having a clear bit. Add some tests to the
test-suite to be sure we don't inadvertently reintroduce this problem.
Unfortunately they're quite noisy so include a message to disregard
the warnings.
Reported-by: Zhenghan Wang <wzhmmmmm@gmail.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'lib/idr.c')
| -rw-r--r-- | lib/idr.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/idr.c b/lib/idr.c index 13f2758c2377..da36054c3ca0 100644 --- a/lib/idr.c +++ b/lib/idr.c @@ -508,7 +508,7 @@ void ida_free(struct ida *ida, unsigned int id) goto delete; xas_store(&xas, xa_mk_value(v)); } else { - if (!test_bit(bit, bitmap->bitmap)) + if (!bitmap || !test_bit(bit, bitmap->bitmap)) goto err; __clear_bit(bit, bitmap->bitmap); xas_set_mark(&xas, XA_FREE_MARK); |