diff options
| author | Enrico Scholz <enrico.scholz@sigma-chemnitz.de> | 2010-06-24 15:02:40 +0200 |
|---|---|---|
| committer | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2010-07-18 09:05:56 +0300 |
| commit | e8457f16306ad6e2c8708275bf42b5dfff40fffd (patch) | |
| tree | 79e85cbe35a5059f3e1a0ddd321fd633f678b041 /compr_rtime.c | |
| parent | 5db0545e2858da5f79d6461544f94c88f6bf7af9 (diff) | |
mkfs.jffs2: fix integer underflow in jffs2_rtime_compress()
When '*dstlen' is 0 or 1, comparison will return wrong result. Reported
by valgrind as
==5919== Invalid write of size 1
==5919== at 0x40564E: jffs2_rtime_compress (compr_rtime.c:51)
==5919== by 0x40676B: jffs2_compress (compr.c:246)
==5919== by 0x403EE4: recursive_populate_directory (mkfs.jffs2.c:884)
==5919== Address 0x4e1bdb1 is 0 bytes after a block of size 1 alloc'd
==5919== at 0x4A0515D: malloc (vg_replace_malloc.c:195)
==5919== by 0x40671C: jffs2_compress (compr.c:229)
==5919== by 0x403EE4: recursive_populate_directory (mkfs.jffs2.c:884)
Signed-off-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'compr_rtime.c')
| -rw-r--r-- | compr_rtime.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/compr_rtime.c b/compr_rtime.c index 131536c..5613963 100644 --- a/compr_rtime.c +++ b/compr_rtime.c @@ -32,7 +32,7 @@ static int jffs2_rtime_compress(unsigned char *data_in, unsigned char *cpage_out memset(positions,0,sizeof(positions)); - while (pos < (*sourcelen) && outpos <= (*dstlen)-2) { + while (pos < (*sourcelen) && outpos+2 <= (*dstlen)) { int backpos, runlen=0; unsigned char value; |