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video/sis/: fix negative array index

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This patch fixes the possible usage of a negative value as an array
index spotted by the Coverity checker.

sisfb_validate_mode() could return a negative error code and we must check for
that prior to using its return value as an array index.

Signed-off-by: Adrian Bunk <[email protected]>
Cc: Thomas Winischhofer <[email protected]>
Cc: "Antonino A. Daplas" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Adrian Bunk 2007-11-14 16:59:02 -08:00 • committed by Linus Torvalds
commit a9e60e5c3c
1 changed files with 2 additions and 1 deletions
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3
drivers/video/sis/sis_main.c
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@ -1248,7 +1248,6 @@ sisfb_do_set_var(struct fb_var_screeninfo *var, int isactive, struct fb_info *in
if(found_mode) {
ivideo->sisfb_mode_idx = sisfb_validate_mode(ivideo,
ivideo->sisfb_mode_idx, ivideo->currentvbflags);
ivideo->mode_no = sisbios_mode[ivideo->sisfb_mode_idx].mode_no[ivideo->mni];
} else {
ivideo->sisfb_mode_idx = -1;
}
@ -1260,6 +1259,8 @@ sisfb_do_set_var(struct fb_var_screeninfo *var, int isactive, struct fb_info *in
return -EINVAL;
}
ivideo->mode_no = sisbios_mode[ivideo->sisfb_mode_idx].mode_no[ivideo->mni];
if(sisfb_search_refresh_rate(ivideo, ivideo->refresh_rate, ivideo->sisfb_mode_idx) == 0) {
ivideo->rate_idx = sisbios_mode[ivideo->sisfb_mode_idx].rate_idx;
ivideo->refresh_rate = 60;