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bcachefs: avoid out-of-bounds in split_devs

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Calling mount with an empty source string causes an out-of-bounds error
in split_devs. Check the length of the source string to avoid this.

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Stijn Tintel 2021-05-13 23:08:47 +03:00 committed by Kent Overstreet
parent 909004d2f9
commit ffcf9ec78c
1 changed files with 4 additions and 0 deletions
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4
fs/bcachefs/fs.c
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@ -32,6 +32,7 @@
#include <linux/random.h>
#include <linux/seq_file.h>
#include <linux/statfs.h>
#include <linux/string.h>
#include <linux/xattr.h>
static struct kmem_cache *bch2_inode_cache;
@ -1324,6 +1325,9 @@ static char **split_devs(const char *_dev_name, unsigned *nr)
char *dev_name = NULL, **devs = NULL, *s;
size_t i, nr_devs = 0;
if (strlen(_dev_name) == 0)
return NULL;
dev_name = kstrdup(_dev_name, GFP_KERNEL);
if (!dev_name)
return NULL;