Commit 20b02366 authored by Rasmus Villemoes's avatar Rasmus Villemoes Committed by Greg Kroah-Hartman

staging: lustre: fix %.2X versus signed char issue

When char is signed and one of the bytes in lmm happens to have a byte
value above 127, the result of printing that with %.2X will be 8 hex
chars, the first 6 of which are 'F'. Worst case, we'll overrun our
'carefully' allocated buffer.

I didn't have the tenacity to work through the gazillion and seven
layers of macros behind CERROR, but I assume it'll all end at some
function implemented in terms of the kernel's vsnprintf. Use %*phN for
a hexdump. That'll cap the number of dumped bytes at 64. If that's a
problem, the loop could be replaced by "bin2hex(buffer, lmm,
lmm_bytes);".
Signed-off-by: default avatarRasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f9167742
...@@ -258,22 +258,9 @@ static int lov_verify_lmm(void *lmm, int lmm_bytes, __u16 *stripe_count) ...@@ -258,22 +258,9 @@ static int lov_verify_lmm(void *lmm, int lmm_bytes, __u16 *stripe_count)
int rc; int rc;
if (lsm_op_find(le32_to_cpu(*(__u32 *)lmm)) == NULL) { if (lsm_op_find(le32_to_cpu(*(__u32 *)lmm)) == NULL) {
char *buffer;
int sz;
CERROR("bad disk LOV MAGIC: 0x%08X; dumping LMM (size=%d):\n", CERROR("bad disk LOV MAGIC: 0x%08X; dumping LMM (size=%d):\n",
le32_to_cpu(*(__u32 *)lmm), lmm_bytes); le32_to_cpu(*(__u32 *)lmm), lmm_bytes);
sz = lmm_bytes * 2 + 1; CERROR("%*phN\n", lmm_bytes, lmm);
buffer = libcfs_kvzalloc(sz, GFP_NOFS);
if (buffer != NULL) {
int i;
for (i = 0; i < lmm_bytes; i++)
sprintf(buffer+2*i, "%.2X", ((char *)lmm)[i]);
buffer[sz - 1] = '\0';
CERROR("%s\n", buffer);
kvfree(buffer);
}
return -EINVAL; return -EINVAL;
} }
rc = lsm_op_find(le32_to_cpu(*(__u32 *)lmm))->lsm_lmm_verify(lmm, rc = lsm_op_find(le32_to_cpu(*(__u32 *)lmm))->lsm_lmm_verify(lmm,
......
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