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05 April 2024, 19:05:47 UTC
Revision 9f2df09a33aa2c76ce6385d382693f98d7f2f07e authored by Tetsuo Handa on 02 November 2018, 22:48:42 UTC, committed by Linus Torvalds on 03 November 2018, 17:09:38 UTC 
bfs: add sanity check at bfs_fill_super()
 
syzbot is reporting too large memory allocation at bfs_fill_super() [1].
Since file system image is corrupted such that bfs_sb->s_start == 0,
bfs_fill_super() is trying to allocate 8MB of continuous memory. Fix
this by adding a sanity check on bfs_sb->s_start, __GFP_NOWARN and
printf().

[1] https://syzkaller.appspot.com/bug?id=16a87c236b951351374a84c8a32f40edbc034e96

Link: http://lkml.kernel.org/r/1525862104-3407-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reported-by: syzbot <syzbot+71c6b5d68e91149fc8a4@syzkaller.appspotmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Tigran Aivazian <aivazian.tigran@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 6f0483d
History
Tip revision: 9f2df09a33aa2c76ce6385d382693f98d7f2f07e authored by Tetsuo Handa on 02 November 2018, 22:48:42 UTC
bfs: add sanity check at bfs_fill_super()
Tip revision: 9f2df09
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