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| author | Matt Fleming <matt@console-pimps.org> | 2009-12-18 02:27:18 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-18 02:45:31 +0300 |
| commit | e8812793637b4f23f01eb46db86b5dad1fc97f2a (patch) | |
| tree | 917fbb17c767f17c486990737d7938c756bdec49 /drivers/mmc/core | |
| parent | 3d10a1ba0d37c8f5fd5afcdda00613fbb8a90bf5 (diff) | |
| download | linux-e8812793637b4f23f01eb46db86b5dad1fc97f2a.tar.xz | |
sdio: initialise SDIO functions and update card->sdio_funcs in lockstep
Daniel Drake noticed a crash in the error path of mmc_attach_sdio(). This
bug is discussed at http://dev.laptop.org/ticket/9707.
BUG: unable to handle kernel paging request at 6b6b6c57
IP: [<b066d6e2>] sdio_remove_func+0x9/0x27
Call Trace:
[<b066cfb4>] ? mmc_sdio_remove+0x34/0x65
[<b066d1fc>] ? mmc_attach_sdio+0x217/0x240
[<b066a22f>] ? mmc_rescan+0x1a2/0x20f
[<b042e9a0>] ? worker_thread+0x156/0x1e
We need to accurately track how many SDIO functions have been initialised
(and keep card->sdio_funcs in sync) so that we don't try to remove more
functions than we initialised if we hit the error path in
mmc_attach_sdio().
Without this patch if we hit the error path in mmc_attach_sdio() we run
the risk of deferencing invalid memory in sdio_remove_func(), leading to a
crash.
Signed-off-by: Matt Fleming <matt@console-pimps.org>
Cc: Daniel Drake <dsd@laptop.org>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/mmc/core')
| -rw-r--r-- | drivers/mmc/core/sdio.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c index cdb845b68ab5..06b64085a355 100644 --- a/drivers/mmc/core/sdio.c +++ b/drivers/mmc/core/sdio.c @@ -516,7 +516,8 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr) * The number of functions on the card is encoded inside * the ocr. */ - card->sdio_funcs = funcs = (ocr & 0x70000000) >> 28; + funcs = (ocr & 0x70000000) >> 28; + card->sdio_funcs = 0; /* * If needed, disconnect card detection pull-up resistor. @@ -528,7 +529,7 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr) /* * Initialize (but don't add) all present functions. */ - for (i = 0;i < funcs;i++) { + for (i = 0; i < funcs; i++, card->sdio_funcs++) { err = sdio_init_func(host->card, i + 1); if (err) goto remove; |