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bfs: add sanity check at bfs_fill_super()

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commit 9f2df09a33aa2c76ce6385d382693f98d7f2f07e upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tetsuo Handa 2018-11-02 15:48:42 -07:00 committed by Greg Kroah-Hartman
parent 9891b528f9
commit 8380cbfe4e
1 changed files with 6 additions and 3 deletions
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9
fs/bfs/inode.c
View file

@ -350,7 +350,8 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent)
s->s_magic = BFS_MAGIC;
if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) {
if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end) ||
le32_to_cpu(bfs_sb->s_start) < BFS_BSIZE) {
printf("Superblock is corrupted\n");
goto out1;
}
@ -359,9 +360,11 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent)
sizeof(struct bfs_inode)
+ BFS_ROOT_INO - 1;
imap_len = (info->si_lasti / 8) + 1;
info->si_imap = kzalloc(imap_len, GFP_KERNEL);
if (!info->si_imap)
info->si_imap = kzalloc(imap_len, GFP_KERNEL | __GFP_NOWARN);
if (!info->si_imap) {
printf("Cannot allocate %u bytes\n", imap_len);
goto out1;
}
for (i = 0; i < BFS_ROOT_INO; i++)
set_bit(i, info->si_imap);