vfat: Fix mkcksum argument sizes

In case a function argument is known/fixed size array in C, the argument is
still decoyed as pointer instead ( T f(U n[k]) ~= T fn(U *n) ) and therefore
calling sizeof on the function argument will result in the size of the pointer,
not the size of the array.

The VFAT code contains such a bug, this patch fixes it.

Reported-by: Aaron Williams <Aaron.Williams@cavium.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Tom Rini <tom.rini@gmail.com>
Cc: Aaron Williams <Aaron.Williams@cavium.com>

diff --git a/fs/fat/fat.c b/fs/fat/fat.c
index 393c3781eb65ba8201339042dc44531f9a36df39..25d3318cd0a8d8baaefee5cd6bc91977511a08ac 100644 (file)
--- a/fs/fat/fat.c
+++ b/fs/fat/fat.c
@@ -569,9 +569,9 @@ static __u8 mkcksum(const char name[8], const char ext[3])
 
        __u8 ret = 0;
 
-       for (i = 0; i < sizeof(name); i++)
+       for (i = 0; i < 8; i++)
                ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + name[i];
-       for (i = 0; i < sizeof(ext); i++)
+       for (i = 0; i < 3; i++)
                ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + ext[i];
 
        return ret;