[PATCH 1 of 3] nfsd4: fix fs locations bounds-checking

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



The comparison here is obviously useless as locations_count is unsigned.

Though fsloc_parse can only be handed data by root, still I'd rather have
some sanity-checking; so set a (generous) maximum number of fslocations to
keep the following kzalloc to a reasonable size.

Signed-off-by: J. Bruce Fields <[email protected]>
---
 fs/nfsd/export.c            |    2 +-
 include/linux/nfsd/export.h |    3 +++
 2 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 7e429ca..71f3655 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -418,7 +418,7 @@ fsloc_parse(char **mesg, char *buf, stru
 	err = get_int(mesg, &fsloc->locations_count);
 	if (err)
 		return err;
-	if (fsloc->locations_count < 0)
+	if (fsloc->locations_count > MAX_FS_LOCATIONS)
 		return -EINVAL;
 	if (fsloc->locations_count == 0)
 		return 0;
diff --git a/include/linux/nfsd/export.h b/include/linux/nfsd/export.h
index 101fb4c..6e78ea9 100644
--- a/include/linux/nfsd/export.h
+++ b/include/linux/nfsd/export.h
@@ -48,6 +48,9 @@ #ifdef __KERNEL__
 /*
  * FS Locations
  */
+
+#define MAX_FS_LOCATIONS	128
+
 struct nfsd4_fs_location {
 	char *hosts; /* colon separated list of hosts */
 	char *path;  /* slash separated list of path components */
-- 
1.4.2.g55c3

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux