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| author | Tom Rix <trix@redhat.com> | 2020-08-05 07:52:08 -0700 |
|---|---|---|
| committer | Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> | 2020-09-08 13:33:06 +0200 |
| commit | ad6f93e9cd56f0b10e9b22e3e137d17a1a035242 (patch) | |
| tree | bc2bace432bc3bdc869941658f54e87f0fea63ea /drivers/video | |
| parent | fe2ab107536d808ad0c8ddce3e35b048dc5acb0f (diff) | |
| download | lwn-ad6f93e9cd56f0b10e9b22e3e137d17a1a035242.tar.gz lwn-ad6f93e9cd56f0b10e9b22e3e137d17a1a035242.zip | |
video: fbdev: sis: fix null ptr dereference
Clang static analysis reports this representative error
init.c:2501:18: warning: Array access (from variable 'queuedata') results
in a null pointer dereference
templ |= ((queuedata[i] & 0xc0) << 3);
This is the problem block of code
if(ModeNo > 0x13) {
...
if(SiS_Pr->ChipType == SIS_730) {
queuedata = &FQBQData730[0];
} else {
queuedata = &FQBQData[0];
}
} else {
}
queuedata is not set in the else block
Reviewing the old code, the arrays FQBQData730 and FQBQData were
used directly.
So hoist the setting of queuedata out of the if-else block.
Fixes: 544393fe584d ("[PATCH] sisfb update")
Signed-off-by: Tom Rix <trix@redhat.com>
Cc: Thomas Winischhofer <thomas@winischhofer.net>
Cc: Andrew Morton <akpm@osdl.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200805145208.17727-1-trix@redhat.com
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/fbdev/sis/init.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/video/fbdev/sis/init.c b/drivers/video/fbdev/sis/init.c index dfe3eb769638..fde27feae5d0 100644 --- a/drivers/video/fbdev/sis/init.c +++ b/drivers/video/fbdev/sis/init.c @@ -2428,6 +2428,11 @@ SiS_SetCRT1FIFO_630(struct SiS_Private *SiS_Pr, unsigned short ModeNo, i = 0; + if (SiS_Pr->ChipType == SIS_730) + queuedata = &FQBQData730[0]; + else + queuedata = &FQBQData[0]; + if(ModeNo > 0x13) { /* Get VCLK */ @@ -2445,12 +2450,6 @@ SiS_SetCRT1FIFO_630(struct SiS_Private *SiS_Pr, unsigned short ModeNo, /* Get half colordepth */ colorth = colortharray[(SiS_Pr->SiS_ModeType - ModeEGA)]; - if(SiS_Pr->ChipType == SIS_730) { - queuedata = &FQBQData730[0]; - } else { - queuedata = &FQBQData[0]; - } - do { templ = SiS_CalcDelay2(SiS_Pr, queuedata[i]) * VCLK * colorth; |