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EXA: Fix mixed pixmaps crash with missing / failing UploadToScreen hook. 

For the recent mixed pixmaps changes, I failed to realize (or hit in my
testing) a problem which can occur if the driver doesn't provide an
UploadToScreen hook or provides one which can fail: There can be a crash
in exaMemcpyBox() because exaCopyDirtyToFb() passes pExaPixmap->fb_ptr to
exaCopyDirty(), but that's normally NULL with driver allocated pixmaps.

The solution is to make exaCopyDirty*() no longer rely on pExaPixmap->fb_ptr
but use pPixmap->devPrivate.ptr after PrepareAccess instead.

Fixes http://bugs.freedesktop.org/show_bug.cgi?id=24167 .
This commit is contained in:
Michel Dänzer 2009-09-27 02:08:10 +02:00
parent c9ec2bab2f
commit 73ae547d5e
1 changed files with 14 additions and 12 deletions
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26
exa/exa_migration_classic.c
View File

@ -104,9 +104,8 @@ exaPixmapShouldBeInFB (PixmapPtr pPix)
static void
exaCopyDirty(ExaMigrationPtr migrate, RegionPtr pValidDst, RegionPtr pValidSrc,
Bool (*transfer) (PixmapPtr pPix, int x, int y, int w, int h,
char *sys, int sys_pitch), CARD8 *fallback_src,
CARD8 *fallback_dst, int fallback_srcpitch, int fallback_dstpitch,
int fallback_index, void (*sync) (ScreenPtr pScreen))
char *sys, int sys_pitch), int fallback_index,
void (*sync) (ScreenPtr pScreen))
{
PixmapPtr pPixmap = migrate->pPix;
ExaPixmapPriv (pPixmap);
@ -228,9 +227,15 @@ exaCopyDirty(ExaMigrationPtr migrate, RegionPtr pValidDst, RegionPtr pValidSrc,
ExaDoPrepareAccess(pPixmap, fallback_index);
access_prepared = TRUE;
}
exaMemcpyBox (pPixmap, pBox,
fallback_src, fallback_srcpitch,
fallback_dst, fallback_dstpitch);
if (fallback_index == EXA_PREPARE_DEST) {
exaMemcpyBox (pPixmap, pBox,
pExaPixmap->sys_ptr, pExaPixmap->sys_pitch,
pPixmap->devPrivate.ptr, pPixmap->devKind);
} else {
exaMemcpyBox (pPixmap, pBox,
pPixmap->devPrivate.ptr, pPixmap->devKind,
pExaPixmap->sys_ptr, pExaPixmap->sys_pitch);
}
} else
need_sync = TRUE;
@ -271,9 +276,8 @@ exaCopyDirtyToSys (ExaMigrationPtr migrate)
ExaPixmapPriv (pPixmap);
exaCopyDirty(migrate, &pExaPixmap->validSys, &pExaPixmap->validFB,
pExaScr->info->DownloadFromScreen, pExaPixmap->fb_ptr,
pExaPixmap->sys_ptr, pExaPixmap->fb_pitch,
pExaPixmap->sys_pitch, EXA_PREPARE_SRC, exaWaitSync);
pExaScr->info->DownloadFromScreen, EXA_PREPARE_SRC,
exaWaitSync);
}
/**
@ -289,9 +293,7 @@ exaCopyDirtyToFb (ExaMigrationPtr migrate)
ExaPixmapPriv (pPixmap);
exaCopyDirty(migrate, &pExaPixmap->validFB, &pExaPixmap->validSys,
pExaScr->info->UploadToScreen, pExaPixmap->sys_ptr,
pExaPixmap->fb_ptr, pExaPixmap->sys_pitch,
pExaPixmap->fb_pitch, EXA_PREPARE_DEST, NULL);
pExaScr->info->UploadToScreen, EXA_PREPARE_DEST, NULL);
}
/**