mtd: sm_ftl: fix NULL pointer warning

With gcc -O3, we get a new warning:

In file included from arch/arm64/include/asm/processor.h:28,
                 from drivers/mtd/sm_ftl.c:8:
In function 'memset',
    inlined from 'sm_read_sector.constprop' at drivers/mtd/sm_ftl.c:250:3:
include/linux/string.h:411:9: error: argument 1 null where non-null expected [-Werror=nonnull]
  return __builtin_memset(p, c, size);

>From all I can tell, this cannot happen (the function is called
either with a NULL buffer or with a -1 block number but not both),
but adding a check makes it more robust and avoids the warning.

Fixes: mmtom ("init/Kconfig: enable -O3 for all arches")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

diff --git a/drivers/mtd/sm_ftl.c b/drivers/mtd/sm_ftl.c
index 4744bf9..b9f2724 100644 (file)
--- a/drivers/mtd/sm_ftl.c
+++ b/drivers/mtd/sm_ftl.c
@@ -247,7 +247,8 @@ static int sm_read_sector(struct sm_ftl *ftl,
 
        /* FTL can contain -1 entries that are by default filled with bits */
        if (block == -1) {
-               memset(buffer, 0xFF, SM_SECTOR_SIZE);
+               if (buffer)
+                       memset(buffer, 0xFF, SM_SECTOR_SIZE);
                return 0;
        }