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[media] vivid: fix smatch errors

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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>
This commit is contained in:
Hans Verkuil 2016-04-15 12:35:31 -03:00 committed by Mauro Carvalho Chehab
parent 1c9f47195e
commit 86b2749ba7
1 changed files with 11 additions and 8 deletions
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19
drivers/media/platform/vivid/vivid-rds-gen.c
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@ -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:
/*