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misc: fastrpc: Fix dma_buf object leak in fastrpc_map_lookup 

In fastrpc_map_lookup, dma_buf_get is called to obtain a reference to
the dma_buf for comparison purposes. However, this reference is never
released when the function returns, leading to a dma_buf memory leak.

Fix this by adding dma_buf_put before returning from the function,
ensuring that the temporarily acquired reference is properly released
regardless of whether a matching map is found.

Fixes: 9031626ade ("misc: fastrpc: Fix fastrpc_map_lookup operation")
Cc: stable@kernel.org
Signed-off-by: Junhao Xie <bigfoot@radxa.com>
Tested-by: Xilin Wu <sophon@radxa.com>
Rule: add
Link: https://lore.kernel.org/stable/48B368FB4C7007A7%2B20251017083906.3259343-1-bigfoot%40radxa.com
Link: https://patch.msgid.link/48B368FB4C7007A7+20251017083906.3259343-1-bigfoot@radxa.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Junhao Xie 2025-10-17 16:39:06 +08:00 committed by Greg Kroah-Hartman
parent 410d6c2ad4
commit fff111bf45
1 changed files with 2 additions and 0 deletions
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2
drivers/misc/fastrpc.c
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@ -381,6 +381,8 @@ static int fastrpc_map_lookup(struct fastrpc_user *fl, int fd,
} }
spin_unlock(&fl->lock); spin_unlock(&fl->lock);
dma_buf_put(buf);
return ret; return ret;
} }