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[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>
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@ -55,6 +55,7 @@ void vivid_rds_generate(struct vivid_rds_gen *rds)
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{
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struct v4l2_rds_data *data = rds->data;
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unsigned grp;
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unsigned idx;
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struct tm tm;
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unsigned date;
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unsigned time;
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@ -73,24 +74,26 @@ void vivid_rds_generate(struct vivid_rds_gen *rds)
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case 0 ... 3:
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case 22 ... 25:
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case 44 ... 47: /* Group 0B */
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idx = (grp % 22) % 4;
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data[1].lsb |= (rds->ta << 4) | (rds->ms << 3);
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data[1].lsb |= vivid_get_di(rds, grp % 22);
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data[1].lsb |= vivid_get_di(rds, idx);
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data[1].msb |= 1 << 3;
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data[2].lsb = rds->picode & 0xff;
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data[2].msb = rds->picode >> 8;
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data[2].block = V4L2_RDS_BLOCK_C_ALT | (V4L2_RDS_BLOCK_C_ALT << 3);
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data[3].lsb = rds->psname[2 * (grp % 22) + 1];
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data[3].msb = rds->psname[2 * (grp % 22)];
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data[3].lsb = rds->psname[2 * idx + 1];
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data[3].msb = rds->psname[2 * idx];
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break;
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case 4 ... 19:
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case 26 ... 41: /* Group 2A */
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data[1].lsb |= (grp - 4) % 22;
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idx = ((grp - 4) % 22) % 16;
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data[1].lsb |= idx;
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data[1].msb |= 4 << 3;
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data[2].msb = rds->radiotext[4 * ((grp - 4) % 22)];
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data[2].lsb = rds->radiotext[4 * ((grp - 4) % 22) + 1];
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data[2].msb = rds->radiotext[4 * idx];
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data[2].lsb = rds->radiotext[4 * idx + 1];
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data[2].block = V4L2_RDS_BLOCK_C | (V4L2_RDS_BLOCK_C << 3);
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data[3].msb = rds->radiotext[4 * ((grp - 4) % 22) + 2];
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data[3].lsb = rds->radiotext[4 * ((grp - 4) % 22) + 3];
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data[3].msb = rds->radiotext[4 * idx + 2];
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data[3].lsb = rds->radiotext[4 * idx + 3];
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break;
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case 56:
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/*
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