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| author | Hans Verkuil <hans.verkuil@cisco.com> | 2016-04-15 18:35:31 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2016-04-20 21:47:33 +0300 |
| commit | 86b2749ba79e78130dd9f678aa52d57992fbdf1c (patch) | |
| tree | 35097eba25bbbb88ad0a1318b0d6915fd58f1d19 /drivers/media | |
| parent | 1c9f47195ef83ffd59ff665f2006789c0610cff0 (diff) | |
| download | linux-86b2749ba79e78130dd9f678aa52d57992fbdf1c.tar.xz | |
[media] vivid: fix smatch errors
The smatch utility got really confused about the grp % 22 code. Rewrote
it so it now understands that there really isn't a buffer overwrite.
vivid-rds-gen.c:82 vivid_rds_generate() error: buffer overflow 'rds->psname' 9 <= 43
vivid-rds-gen.c:83 vivid_rds_generate() error: buffer overflow 'rds->psname' 9 <= 42
vivid-rds-gen.c:89 vivid_rds_generate() error: buffer overflow 'rds->radiotext' 65 <= 84
vivid-rds-gen.c:90 vivid_rds_generate() error: buffer overflow 'rds->radiotext' 65 <= 85
vivid-rds-gen.c:92 vivid_rds_generate() error: buffer overflow 'rds->radiotext' 65 <= 86
vivid-rds-gen.c:93 vivid_rds_generate() error: buffer overflow 'rds->radiotext' 65 <= 87
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/platform/vivid/vivid-rds-gen.c | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/drivers/media/platform/vivid/vivid-rds-gen.c b/drivers/media/platform/vivid/vivid-rds-gen.c index c382343fdb66..53c7777dc001 100644 --- a/drivers/media/platform/vivid/vivid-rds-gen.c +++ b/drivers/media/platform/vivid/vivid-rds-gen.c @@ -55,6 +55,7 @@ void vivid_rds_generate(struct vivid_rds_gen *rds) { struct v4l2_rds_data *data = rds->data; unsigned grp; + unsigned idx; struct tm tm; unsigned date; unsigned time; @@ -73,24 +74,26 @@ void vivid_rds_generate(struct vivid_rds_gen *rds) case 0 ... 3: case 22 ... 25: case 44 ... 47: /* Group 0B */ + idx = (grp % 22) % 4; data[1].lsb |= (rds->ta << 4) | (rds->ms << 3); - data[1].lsb |= vivid_get_di(rds, grp % 22); + data[1].lsb |= vivid_get_di(rds, idx); data[1].msb |= 1 << 3; data[2].lsb = rds->picode & 0xff; data[2].msb = rds->picode >> 8; data[2].block = V4L2_RDS_BLOCK_C_ALT | (V4L2_RDS_BLOCK_C_ALT << 3); - data[3].lsb = rds->psname[2 * (grp % 22) + 1]; - data[3].msb = rds->psname[2 * (grp % 22)]; + data[3].lsb = rds->psname[2 * idx + 1]; + data[3].msb = rds->psname[2 * idx]; break; case 4 ... 19: case 26 ... 41: /* Group 2A */ - data[1].lsb |= (grp - 4) % 22; + idx = ((grp - 4) % 22) % 16; + data[1].lsb |= idx; data[1].msb |= 4 << 3; - data[2].msb = rds->radiotext[4 * ((grp - 4) % 22)]; - data[2].lsb = rds->radiotext[4 * ((grp - 4) % 22) + 1]; + data[2].msb = rds->radiotext[4 * idx]; + data[2].lsb = rds->radiotext[4 * idx + 1]; data[2].block = V4L2_RDS_BLOCK_C | (V4L2_RDS_BLOCK_C << 3); - data[3].msb = rds->radiotext[4 * ((grp - 4) % 22) + 2]; - data[3].lsb = rds->radiotext[4 * ((grp - 4) % 22) + 3]; + data[3].msb = rds->radiotext[4 * idx + 2]; + data[3].lsb = rds->radiotext[4 * idx + 3]; break; case 56: /* |