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authorNikolaus Schulz <microschulz@web.de>2010-04-01 02:21:10 +0900
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-31 10:34:11 -0700
commit30d1872d9eb3663b4cf7bdebcbf5cd465674cced (patch)
treee3771c93ad38ad5e8f9d8c70a0915afb81423545 /fs/fat
parent2eaa9cfdf33b8d7fb7aff27792192e0019ae8fc6 (diff)
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fat: fix buffer overflow in vfat_create_shortname()
When using the string representation of a random counter as part of the base name, ensure that it is no longer than 4 bytes. Since we are repeatedly decrementing the counter in a loop until we have found a unique base name, the counter may wrap around zero; therefore, it is not enough to mask its higher bits before entering the loop, this must be done inside the loop. [hirofumi@mail.parknet.co.jp: use snprintf()] Signed-off-by: Nikolaus Schulz <microschulz@web.de> Cc: stable@kernel.org Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/fat')
-rw-r--r--fs/fat/namei_vfat.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index c1ef50154868..6fcc7e71fbaa 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -309,7 +309,7 @@ static int vfat_create_shortname(struct inode *dir, struct nls_table *nls,
{
struct fat_mount_options *opts = &MSDOS_SB(dir->i_sb)->options;
wchar_t *ip, *ext_start, *end, *name_start;
- unsigned char base[9], ext[4], buf[8], *p;
+ unsigned char base[9], ext[4], buf[5], *p;
unsigned char charbuf[NLS_MAX_CHARSET_SIZE];
int chl, chi;
int sz = 0, extlen, baselen, i, numtail_baselen, numtail2_baselen;
@@ -467,7 +467,7 @@ static int vfat_create_shortname(struct inode *dir, struct nls_table *nls,
return 0;
}
- i = jiffies & 0xffff;
+ i = jiffies;
sz = (jiffies >> 16) & 0x7;
if (baselen > 2) {
baselen = numtail2_baselen;
@@ -476,7 +476,7 @@ static int vfat_create_shortname(struct inode *dir, struct nls_table *nls,
name_res[baselen + 4] = '~';
name_res[baselen + 5] = '1' + sz;
while (1) {
- sprintf(buf, "%04X", i);
+ snprintf(buf, sizeof(buf), "%04X", i & 0xffff);
memcpy(&name_res[baselen], buf, 4);
if (vfat_find_form(dir, name_res) < 0)
break;