diff options
| author | Wagner Popov dos Santos <wpopov@gmail.com> | 2021-02-22 23:30:58 -0300 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2021-04-07 10:22:22 -0400 |
| commit | 610a2cc7a38782bf2fa5c1037959a42838ebb2ad (patch) | |
| tree | 5a6b392ffa848995cd93ddb73f195c4ac3fc7f97 | |
| parent | 02395fec007657c5beb4f7fd77784e10b3054c90 (diff) | |
JFFS2: fix the reading address over nand's limit
Fixes address violation in functions read_nand_cached() and
read_onenand_cached(). This happens because these functions
try to read a fixed amount
of data even when the offset+length
is above the nand's limit.
Signed-off-by: Wagner Popov dos Santos <wpopov@gmail.com>
| -rw-r--r-- | fs/jffs2/jffs2_1pass.c | 37 |
1 files changed, 27 insertions, 10 deletions
diff --git a/fs/jffs2/jffs2_1pass.c b/fs/jffs2/jffs2_1pass.c index a98745c50e..b39943671c 100644 --- a/fs/jffs2/jffs2_1pass.c +++ b/fs/jffs2/jffs2_1pass.c @@ -180,6 +180,7 @@ static int read_nand_cached(u32 off, u32 size, u_char *buf) struct mtd_info *mtd; u32 bytes_read = 0; size_t retlen; + size_t toread; int cpy_bytes; mtd = get_nand_dev_by_index(id->num); @@ -187,8 +188,12 @@ static int read_nand_cached(u32 off, u32 size, u_char *buf) return -1; while (bytes_read < size) { + retlen = NAND_CACHE_SIZE; + if( nand_cache_off + retlen > mtd->size ) + retlen = mtd->size - nand_cache_off; + if ((off + bytes_read < nand_cache_off) || - (off + bytes_read >= nand_cache_off+NAND_CACHE_SIZE)) { + (off + bytes_read >= nand_cache_off + retlen)) { nand_cache_off = (off + bytes_read) & NAND_PAGE_MASK; if (!nand_cache) { /* This memory never gets freed but 'cause @@ -201,16 +206,20 @@ static int read_nand_cached(u32 off, u32 size, u_char *buf) } } - retlen = NAND_CACHE_SIZE; + toread = NAND_CACHE_SIZE; + if( nand_cache_off + toread > mtd->size ) + toread = mtd->size - nand_cache_off; + + retlen = toread; if (nand_read(mtd, nand_cache_off, &retlen, nand_cache) < 0 || - retlen != NAND_CACHE_SIZE) { + retlen != toread) { printf("read_nand_cached: error reading nand off %#x size %d bytes\n", - nand_cache_off, NAND_CACHE_SIZE); + nand_cache_off, toread); return -1; } } - cpy_bytes = nand_cache_off + NAND_CACHE_SIZE - (off + bytes_read); + cpy_bytes = nand_cache_off + retlen - (off + bytes_read); if (cpy_bytes > size - bytes_read) cpy_bytes = size - bytes_read; memcpy(buf + bytes_read, @@ -283,11 +292,16 @@ static int read_onenand_cached(u32 off, u32 size, u_char *buf) { u32 bytes_read = 0; size_t retlen; + size_t toread; int cpy_bytes; while (bytes_read < size) { + retlen = ONENAND_CACHE_SIZE; + if( onenand_cache_off + retlen > onenand_mtd.size ) + retlen = onenand_mtd.size - onenand_cache_off; + if ((off + bytes_read < onenand_cache_off) || - (off + bytes_read >= onenand_cache_off + ONENAND_CACHE_SIZE)) { + (off + bytes_read >= onenand_cache_off + retlen)) { onenand_cache_off = (off + bytes_read) & ONENAND_PAGE_MASK; if (!onenand_cache) { /* This memory never gets freed but 'cause @@ -300,16 +314,19 @@ static int read_onenand_cached(u32 off, u32 size, u_char *buf) } } - retlen = ONENAND_CACHE_SIZE; + toread = ONENAND_CACHE_SIZE; + if( onenand_cache_off + toread > onenand_mtd.size ) + toread = onenand_mtd.size - onenand_cache_off; + retlen = toread; if (onenand_read(&onenand_mtd, onenand_cache_off, retlen, &retlen, onenand_cache) < 0 || - retlen != ONENAND_CACHE_SIZE) { + retlen != toread) { printf("read_onenand_cached: error reading nand off %#x size %d bytes\n", - onenand_cache_off, ONENAND_CACHE_SIZE); + onenand_cache_off, toread); return -1; } } - cpy_bytes = onenand_cache_off + ONENAND_CACHE_SIZE - (off + bytes_read); + cpy_bytes = onenand_cache_off + retlen - (off + bytes_read); if (cpy_bytes > size - bytes_read) cpy_bytes = size - bytes_read; memcpy(buf + bytes_read, |