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Fix possible crash if bitmap metadata is bad. 

We really should never divide by 0.

Thanks to "Jon Nelson" <jnelson-linux-raid@jamponi.net>
for finding the problem.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2009-02-02 11:06:38 +11:00
parent 0083584d5e
commit b47dff6675
1 changed files with 1 additions and 1 deletions
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2
bitmap.c
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@ -162,7 +162,7 @@ bitmap_info_t *bitmap_fd_read(int fd, int brief)
sb_le_to_cpu(&info->sb); /* convert superblock to CPU byte ordering */
if (brief || info->sb.sync_size == 0)
if (brief || info->sb.sync_size == 0 || info->sb.chunksize == 0)
goto out;
/* read the rest of the file counting total bits and dirty bits --