Last commit 3831530dcb7b71329c272ccd6181f8038b6a6dd0a was intended
"explicitly specify FAT12/16 root directory parsing buffer size, instead
of relying on cluster size". Howver, the underlying function requires
the size of the buffer in blocks, not in bytes, and instead of passing
a double sector size a request for 1024 blocks is sent. This generates
a buffer overflow with overwriting of other structure (in the case seen,
USB structures were overwritten).
Signed-off-by: Stefano Babic <sba...@denx.de>
CC: Mikhail Zolotaryov <le...@lebon.org.ua>
---
fs/fat/fat.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/fs/fat/fat.c b/fs/fat/fat.c
index 744e961..a75e4f2 100644
--- a/fs/fat/fat.c
+++ b/fs/fat/fat.c
@@ -858,7 +858,7 @@ do_fat_read (const char *filename, void *buffer, unsigned
long maxsize,
if (disk_read(cursect,
(mydata->fatsize == 32) ?
(mydata->clust_size) :
- LINEAR_PREFETCH_SIZE,
+ LINEAR_PREFETCH_SIZE / SECTOR_SIZE,
do_fat_read_block) < 0) {
debug("Error: reading rootdir block\n");
return -1;
--
1.7.1
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