librbd: don't crash on a zero-length read if buffer is NULL #57433
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While at it, don't assign ret unnecessarily. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Currently only data is checked, based on the size of the file. Check that the size of the image matches that. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
While legal, it's specified as implementation-defined behavior and newer valgrind throws InvalidSize error on it. Fixes: https://tracker.ceph.com/issues/65813 Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
The previous commit uncovered an old bug, introduced in commit 9867804 ("Striper: Add function 'assemble_result(CephContext *cct, char *buffer, size_t len)' in StripedReadResult."). The buffer is allowed to be NULL when assemble_result() is called -- it becomes a problem only if some data was read. Strengthen ZeroLengthRead and ZeroLengthWrite tests to cover both a bogus pointer and a NULL pointer for buffer. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
ajarr
approved these changes
May 13, 2024
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