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authorColin Ian King <colin.king@canonical.com>2018-10-31 01:06:35 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-10-31 18:54:13 +0300
commit6c9a3f843a29d6894dfc40df338b91dbd78f0ae3 (patch)
tree82da08ad2019ceaa7e078fb5f595290950a08bca /fs/hfs
parent8cd3cb5061730af085a3f9890a3352f162b4e20c (diff)
downloadlinux-6c9a3f843a29d6894dfc40df338b91dbd78f0ae3.tar.xz
fs/hfs/extent.c: fix array out of bounds read of array extent
Currently extent and index i are both being incremented causing an array out of bounds read on extent[i]. Fix this by removing the extraneous increment of extent. Ernesto said: : This is only triggered when deleting a file with a resource fork. I : may be wrong because the documentation isn't clear, but I don't think : you can create those under linux. So I guess nobody was testing them. : : > A disk space leak, perhaps? : : That's what it looks like in general. hfs_free_extents() won't do : anything if the block count doesn't add up, and the error will be : ignored. Now, if the block count randomly does add up, we could see : some corruption. Detected by CoverityScan, CID#711541 ("Out of bounds read") Link: http://lkml.kernel.org/r/20180831140538.31566-1-colin.king@canonical.com Signed-off-by: Colin Ian King <colin.king@canonical.com> Reviewed-by: Ernesto A. Fernndez <ernesto.mnd.fernandez@gmail.com> Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Hin-Tak Leung <htl10@users.sourceforge.net> Cc: Vyacheslav Dubeyko <slava@dubeyko.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/hfs')
-rw-r--r--fs/hfs/extent.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/hfs/extent.c b/fs/hfs/extent.c
index 5f1ff97a3b98..263d5028d9d1 100644
--- a/fs/hfs/extent.c
+++ b/fs/hfs/extent.c
@@ -304,7 +304,7 @@ int hfs_free_fork(struct super_block *sb, struct hfs_cat_file *file, int type)
return 0;
blocks = 0;
- for (i = 0; i < 3; extent++, i++)
+ for (i = 0; i < 3; i++)
blocks += be16_to_cpu(extent[i].count);
res = hfs_free_extents(sb, extent, blocks, blocks);