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Commit dab8fe7e authored by Colin Ian King's avatar Colin Ian King Committed by Greg Kroah-Hartman
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staging: exfat: check for null return from call to FAT_getblk 



A call to FAT_getblk is missing a null return check which can
lead to a null pointer dereference.  Fix this by adding a null
check to match all the other FAT_getblk return sanity checks.

Addresses-Coverity: ("Dereference null return")
Fixes: c48c9f7f ("staging: exfat: add exfat filesystem code to staging")
Signed-off-by: default avatarColin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20190830175050.12706-1-colin.king@canonical.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 32910124

drivers/staging/exfat/exfat_cache.c

+2 −0
Original line number Diff line number Diff line
@@ -369,6 +369,8 @@ static s32 __FAT_write(struct super_block *sb, u32 loc, u32 content) 
				FAT_modify(sb, sec);



				fat_sector = FAT_getblk(sb, ++sec);

				if (!fat_sector)

					return -1;

				fat_sector[0] = (u8)((fat_sector[0] & 0xF0) |

						     (content >> 8));

			} else {