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msm:ADSPRPC :Fix to avoid Use after free in fastrpc_internal_munmap

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Added a check to validate map before freeing it to avoid Use after
free scenario.

Change-Id: I484391ff7c55c0689530a928a2821ee5a1a0e10c
Signed-off-by: Jeya R <jeyr@codeaurora.org>
This commit is contained in:
Jeya R 2020-12-31 17:03:46 +05:30 • committed by Vamsi krishna Gattupalli
commit a7f46c9cb7
1 changed files with 6 additions and 1 deletions
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7
drivers/char/adsprpc.c
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@ -4498,8 +4498,13 @@ static int fastrpc_internal_munmap(struct fastrpc_file *fl,
mutex_unlock(&fl->map_mutex);
if (err)
goto bail;
VERIFY(err, map != NULL);
if (err) {
err = -EINVAL;
goto bail;
}
VERIFY(err, !(err = fastrpc_munmap_on_dsp(fl, map->raddr,
map->phys, map->size, map->flags)));
map->phys, map->size, map->flags)));
if (err)
goto bail;
mutex_lock(&fl->map_mutex);